Loom stopping mechanism



June 22, 1937. D, sRwN 2,084,550

LOOM STOPPING MECHANISM Filed Dec. 51, 1936 INVENTOR. CAEL 0. Bean/N.

ATTORNEY.

Patented June 22, 1937 UNITED STATES PATENT OFFICE LOOM STOPPINGMECHANISM ration of Maine Application" December 31, 1936, Serial No.118,593

14 Claims.

The present invention pertains to fly shuttle looms and moreparticularly to mechanism for effecting loom stoppage upon failure ofthe shuttle to properly complete its flight across the 6' loom.

In looms of the type to which my invention pertains, a reciprocating laycarries a shuttle box adapted to receive the shuttle when the latter hasproperly completed its flight across the loom. 10 Loom stoppingmechanism, commonly called protection mechanism, is controlled by meanswhich determines the presence or absence of the shuttle in the shuttlebox at a predetermined point in the cycle of movement of the lay. Prior1 to the present invention, the most commonly used protection mechanismwas of the protector-rod type and this mechanism was controlled by thewell-known binder in the shuttle box. The binder is thus required toperform two functions, l. e. the checking of the shuttle and thecontrolling of the protection mechanism. Where the binder is properlyshaped to most efficiently check the shuttle, operation of theprotection mechanism begins a little earlier in the loom J2 cycle thanis desirable and is not always fast enough to cause the daggerstoproperly clear the frogs. Furthermore, the ,pressure of the protectionmechanism on the binder causes the latter to frictionally resist thepicking of the o shuttle out of the shuttle box.

It is the principal object of the present invention to provide a loomhaving a reciprocating lay, a shuttle box and suitable protectionmechanism as aforesaid, and means for operating the pro- 4 5 tectionmechanism comprising a lever pivoted to the lay and a cam projectinginto the shuttle box i and operated by an incoming shuttle for movingsuch lever, such cam to operate the protection mechanism independentlyof such shuttle check- -".40 ing mechanism as may be provided.

The preferred embodiment of the invention includes the aforementionedwell-known protector rod type of protection mechanism and a lever foroperating the same extends longitudinally of the shuttle box and ispivoted to the shuttle box at its outer end. The inner end of the leveris free and is engaged by the protector rod finger. A lever-operatingcam is pivoted in one wall of the shuttle box and projects into theshuttle box in position to be rotated by frictional engagement with anincoming shuttle. The preferred cam is so shaped as to offer very littleresistance to the picking of the shuttle out of the shuttle box, and isalso arranged to be automatically rotated to shuttle receiving positionby pressure derived from the protector rod finger.

The above mentioned and other objects of the invention are accomplishedby the construction shown on the drawing, of which:

Fig. l is a view, partly in elevation and partly in section on line l|of Fig. 2, of a loom having the said preferred embodiment of myinvention applied thereto;

Fig. 2 is a plan view of part of the mechanism shown on Fig. 1;

Fig. 3 is a View of the same in rear elevation; and

Fig. 4 is a fragmentary plan view showing the position of certain partswhen the shuttle is absent from the shuttle box.

The loom shown on the drawing includes conventional mechanisms whichform no part of the present invention and which are accordingly notillustrated. However, of the conventional parts of the loom I have showna part of a right hand loom side I which comprises part of the loomframe, a sword 2 carrying a lay beam 3, a pitman 4 by which the lay isreciprocated, a picker stick 5 for picking the usual shuttle 6, and ashipper or controlling handle 1, all of which are well-known in the art.The particular protection mechanism shown is also old in that itincludes the usual protector rod 8 carrying a dagger 9 for engagementwith a frog ID for stopping the loom, the protection rod being biased toloom-stopping position (counterclockwise, Fig. l) by a spring, notshown, and being moved to loom-running position by a novel means whichoperates the protector rod finger il.

The lay has a shuttle box at each end for receiving the shuttle and fromwhich the shuttle is picked by the picker sticks. The drawing shows onlyone such shuttle box, the other box being of the same or any suitableconstruction. The shuttle box shown includes a front box plate I2 whichis fixed to the lay and a back box plate 13 having its outer end fixedto the lay by a bolt 14 and its inner end fixed to the sword 2. A topplate [6 of the shuttle box in carried by the back box plate.

The particular protector rod finger H, which is fixed to the protectorrod 8, extends upwardly in back of the lay. The form of means shown onthe drawing for operating the protection mechanism is accordinglypositioned at the back of the lay and includes a lever ll. This lever ispivoted at its outer end to the lay, it being mounted on a pin l8 whichis fixed in a vertical position in the back box plate I3. The lever Hexmovement of the lever about its pivot l8.

, Ihe lever H is not directly engaged by the ,shuttle, but its operativeposition is controlled by a member 19 which is interposed between thelever and the path of the shuttle. The particular form of member I 9shown is in the form of a cam pivoted to the lay by being mounted on avertical pin 20 in the back wall of the shuttle box. The cam has asurface 2| which engages the lever H at a point intermediate the endsthereof, for moving the lever and protector rod finger rear- Wardly whenthe cam is rotated.

The cam i9 is also provided with a cam surface 22 which, as shown moreclearly by Fig. 4, projects into the shuttle box in position to beengaged by an incoming shuttle. It will be apparent that as the shuttle6 strikes. the surface 22 in entering into the shuttle box, the cam I9will be rotated in a counterclockwise direction, Fig. 4. Upon suchrotation of the cam the surface 2! moves the lever I! rearwardly,thereby moving the finger ll rearwardly and raising the dagger 9 abovethe frog I0.

An important feature of the cam 39 shown on the drawing is that the camis so shaped that when the shuttle is in the box substantially all ofthe pressure from the finger l l on the lever i! is transmitted to thepivot pin 29 rather than to the shuttle. This condition exists becausethe parts are so arranged that when the shuttle is in the box the pivotpin 20 and the point of contact between the cam and lever are inalignment transversely of the lay and shuttle box at an acute anglethereto, which angle is preferably nearly but not quite a right angle.Thus, the cam offers very little resistance to the picking of theshuttle out of the shuttle box.

A further important feature of the particular c am l9 shown is that thecam surface 2! is so shaped that pressure of the lever I'I thereonrotates the cam clockwise from the position of Fig. 2 to the position ofFig. 4 when the shuttle is absent from the shuttle box. Thus, theresetting of the cam to shuttle receiving position is accomplishedwithout the use of any springs other than the usual protector rod spring(not shown) which causes the finger II to press on the lever l! as abovementioned.

The location of the cam I9 and its pivot 2i? intermediate the ends ofthe lever H is of advantage in that a comparatively small movement ofthe cam is multiplied at the inner end of the lever, to thereby producea relatively greater movement of the protector rod finger. Such locationof the cam also results in the non-engagement of the dagger 9 with thefrog I0 being determined only after the shuttle has entered into theshuttle box far enough to be entirely clear of the warp. Operation ofthe-dagger by the cam means results in a very rapid movement of thedagger and thus insures that the dagger will properly clear the frogwhen stopping of the loom is not to be eifected. V

The means for operating the protection mechanism, as above described,exerts little checking action on the shuttle and it is accordinglynecessary to provide other means for this purpose. The present inventiondeals only with the protection mechanism and operating means thereforand does not include means for checking the shuttle. The drawing doesshow, however, a shuttle checking means which may be employed if sodesired. As shown, the shuttle checking means comprises fibre plungers23, 23 loosely positioned in the back box plate and urged forwardly by aspring 24 which bears against a plate 25 connecting the plungerstogether. A member 26, fixed to the back box plate, is provided with aninclined shuttle engaging surface for positively limiting movement ofthe shuttle towardthe picker stick.

Having fully disclosed the preferred embodiment of my invention, Iclaim:

1. In a fiy shuttle loom, the combination of a lay having a shuttle box,protection mechanism including a protector rod finger, a lever pivotedto the lay for operating said finger, and a. cam operating said lever,said cam being pivotally mounted on the lay and projecting into theshuttle box in position to be. engagedand rotated by an incomingshuttle.

2. In a fly shuttle loom, the combination of a lay having a shuttlebox,protection mechanism including a protector rod finger, a lever pivotedat one end to thetlay and engaging said finger for operating'the'latter, and acam pivotally mounted on the lay and engaging and operatingsaid lever, said cam projecting into the shuttle box in position to beengaged and rotated by an incoming shuttle.v

3. In a fly shuttleloom, the combination of a lay having a shuttle box,a lever pivoted-at one end to the lay and having its other en'd free,protection mechanism including a fingerengtaging and operated by thefree end of said lever, and a cam engaging said lever intermediate theends of the latter, said cam beingpivoted to the lay and projecting intothe shuttle" box in position to be engaged and rotated by an incomingshuttle.

4. In a fly shuttle loom, the combination of a lay having a shuttle box,a lever pivoted at its outer end to the lay and having its inner endfree, protection mechanism including a. finger g engaging and operatedby the innerend of said lever, and a cain'engaging and operating saidlever, said cam being pivoted to the lay on a ver tical axisintermediate the ends. of said lever,

said cam projecting into the'shiuttle box in posi- 1 tion to be rotatedby engagement with an incoming shuttle.

5. In a fly shuttle loom, the combination of a lay having a shuttle box,a lever pivoted at its outer end to o-ne'wall of the shuttle box, saidlever extending lengthwise of the shuttle'bo-x and its inner end beingfree, protection mechanism including a protector rod finger engaging andoperated by the inner free end of said lever, and

a cam pivoted in said wall of the shuttle box intermediate the ends ofsaid lever, said cam engaging said lever for operating the latter, .saidcam projecting into the'shuttle box in position to be rotatedbyengagement with an incoming shuttle. V

6. In a fiy shuttle loom, the combination of a lay having a shuttlebox,a lever pivoted at its outer end to one wall of the shuttle box, saidlever extending lengthwise of the shuttle box and its inner end beingfree, protection mechanism operated by the inner end of said lever, anda member pivoted in said wall'of the shuttle box intermediate the endsof said lever, said member engaging said lever for controlling theoperative position thereof, said member projecting-into the shuttle boxin position to be rotated by engagement with an incoming shuttle.

7. In a fly shuttle loom, the combination of a lay having a shuttle box,a lever pivoted at one end to the lay and having its other end free,protection mechanism operated by the free end of said lever, and amember pivoted to the lay intermediate the ends of said lever, saidmember having a portion engaging said lever and moving the same when themember is rotated, said member projecting into the shuttle box inposition to be engaged and rotated by an incoming shuttle.

8. In a fly shuttle loom, the combination of a lay having a shuttle box,a lever pivoted to the lay and extending generally longitudinallythereof, protection mechanism including a finger pressing against andoperated by said lever, and a cam pivoted to the lay and engaging saidlever for operating the latter, said cam projecting into said shuttlebox in position tobe engaged and rotated by an incoming shuttle, thepivot of said cam and the point of engagement of the cam with said leverbeing in alignment transversely of the lay at an acute angle theretowhen a shuttle is in the shuttle box, to thereby relieve the shuttle ofpressure transmitted by said finger.

9. In a fly shuttle loom, the combination of a lay having a shuttle box,a lever pivoted at one end to the lay and having its other end free,protection mechanism including a finger pressing against and operated bythe free end of said lever, and a cam pivoted to the lay and engagingsaid lever for operating the latter, said cam projecting into saidshuttle box in position to be engaged and rotated by an incomingshuttle, the relative positions of the pivot of the cam and the point ofengagement of the cam with said lever being such that when a shuttle isin the shuttle box substantially all of the pressure of said finger onsaid lever is transmitted to said pivot rather than to the shuttle.

10. In a fly shuttle loom, the combination of a lay having a shuttlebox, a lever pivoted to the lay, protection mechanism including a fingerpressing against and operated by said lever, and a cam pivoted to thelay and having a surface engaging said lever and operating the latterwhen the cam is rotated, said cam projecting into the shuttle box inposition to be engaged and rotated by an incoming shuttle, said leverengaging surface and the pivot of the cam being in alignment nearly butnot quite at a right angle to said lever when the cam is rotated asaforesaid.

11. In a fly shuttle loom, the combination of a lay having a shuttlebox, a lever pivoted to the lay, protection mechanism including a fingerpressing against and operated by said lever, and

a cam pivoted to the lay and engaging said lever for operating thelatter, said cam projecting into saidshuttle box in position to beengaged and rotated in one direction by an incoming shuttle, the shapeof said'cam being such that the cam is rotated in the opposite directionby pressure of said finger on said lever when the shuttle is absent fromthe shuttle box.

12. In a fly shuttle loom, the combination of a lay having a shuttlebox, a lever extending longitudinally of the shuttle box and having itsouter end pivoted to the lay, the inner end of said lever being free,protection mechanism including a finger pressing against and operated bythe inner end of said lever, and a cam pivotally mounted in one wall ofsaid shuttle box intermediate the ends of said lever, said cam beingconstructed and arranged to be rotated in one direction by an incomingshuttle to thereby operate said lever and to be rotated in the oppositedirection by pressure of said finger on said lever when the shuttle isabsent from the box.

13. In a fly shuttle loom, the combination of a lay having a shuttlebox, a lever pivoted to the lay, protection mechanism including a fingerpressing against and operated by said lever, and a cam pivoted to thelay and projecting into said shuttle box in position to be engaged androtated in one direction by an incoming shuttle, said cam having asurface engaging said lever and moving the latter when the cam isrotated in said direction, said surface and the pivot of said cam beingin alignment at an acute angle to said lever when a shuttle is in theshuttle box and the shape of said surface being such that the cam isrotated in the opposite direction by pressure of said finger on saidlever when no shuttle is present in the shuttle box.

14. In a fly shuttle loom, the combination of a lay having a shuttlebox, a lever extending longitudinally of the shuttle box and having itsouter end pivoted to the lay, the inner end of said lever being free,protection mechanism including a finger pressing against and operated bythe inner end of said lever, and a. cam pivotally mounted in one wall ofsaid shuttle box and projecting into the shuttle box in position to beengaged and rotated in one direction by an incoming shuttle, said camhaving a surface engaging and moving said lever when the cam is rotatedin said direction, said cam being constructed and arranged sothat saidsurface and the pivot of the cam are in alignment at an acute angle tothe lay when a shuttle is in the shuttle box and the cam is rotatedopposite to said direction by pressure of said lever on the cam when noshuttle is present in the shuttle box.

CARL D. BROWN.

